February 2009 Wyoming Water Supply Outlook


...Well above normal spring and summer runoff volumes expected over the Powder and Tongue River Basins...

...Near normal to slightly above normal spring and summer runoff volumes are forecasted over much of western, central, and southeastern Wyoming's major watersheds...

...Major drainage basins in south central and southwestern Wyoming are expected to see below normal spring and summer runoff volumes....

Mountain snowpack across Wyoming is 100 percent of normal. Snowpack "water" numbers and/or snow water equivalent (SWEs) figures at the beginning of February were the highest across northern and southeastern Wyoming--with 105-120 percent of normal.  SWEs across the central (to include the southern Wind River Mountains) and southwestern mountains varied from 50 to 90 percent of normal.

Above normal snowmelt streamflow volumes are expected across the northern, western, and southeastern watersheds--to include the Shoshone, Tongue, Powder, and Little Snake Basins.  The Powder and Tongue River Watersheds are expected to see the highest water supply volumes during the spring and summer runoff--at 120 to 142 percent of normal. 

The Lower Green, Lower Wind, Upper Bear, and Sweetwater Watersheds are expected to see below average snowmelt streamflow volumes. 

 The latest Wyoming water supply outlook graphic:


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